Disable requesting membership to subgroups
Merge pull request #884 from loomio/request-membership

Disallow subgroup membership request if user is not member of parent group
Bugfix: parent members couldn't request membership to subgroups
Merge pull request #885 from loomio/request-membership

Bugfix: parent members couldn't request membership to subgroups
Merge branch 'master' of github.com:loomio/loomio into feature/change-comments-from-polymorphic-to-normal

Conflicts:
	app/models/ability.rb
	spec/models/ability_spec.rb